Abrading machine



June 10,1930. c, MATTISQN 1,762,339

ABRADING MACHINE Filed April a, 1926- 3 Sheets-Sheet 1 Qzr Awe/206 {am/2.4,?

June 10, 193(1- c. MATTISON 1,752,339

- ABRAD'ING MACHINE Filed April s, 1926 s Sheets-Sheet 2 Ml Lazmwweflafiom e-4W FAA; v

June 10, 1930.

C. L. MATTISON ABRADING MACHINE Filed April 8, 1926 3 Sheets-Sheet 3 latented .lune lfll 1930 ABE-ADIDTG- 33,. ILLINOIS, .ASSIG.

'ro MATTISON MA.- ion' or ILLINOIS MAGHIIZJE Application filed April 8, 1926. Serial No. 100,5 9.

This invention relates to abrading or polish ng machines and refers more particularly to that type in which an endless abrading or polishing belt is applied to the work piece by s means of a reciprocating presser shoe which bears upon one run of the traveling belt.

The general object of the invention is to produces machine in which the reciprocating path of the shoe is not only adjustable in length but longitudinally shiltable on the machine for the purpose of working most eiiiciently on irregularly shaped stock, for example, such as the tops of grand pianos.

In my prior Patents Nos. 1,4389% and 1,418,575 there are disclosed machines of i this type traverses the worlr in slightly spaced relation thereto which belt is adapted to be pressed onto the work by areciprocating shoe on the inner side of the endless bolt. in said patents there are shown and described means for oscillating the shoe along the lower run of the belt and also means for varying both the speed. and the length of the stroke of the presser shoe. The mechanism for controlling the motion of the shoe in the machines of said patents has been shown as fixedly mounted in the center of the machine bed. By the construction. of the prior machines in order to shift the path of the reciprocating shoe, it has been necessary to unclamp the shoe fronithe steel tape which aotuates it and to reposition the shoe on the band in a difi'erent place. I

The aim of the present invention is to provide means to effect shifting of the path of reciprocationrelative to the work with out stopping the shoe for the purpose.

A further object is to provide means for shifting both the tape and the shoe as a unit with a motion in addition to the reciprocm 'tion.

' l A particular object is toprovide the shoe actuating mechanism on a carriage movable along the length of the machine whereby to permit shifting the center of reciprocation Min accordanc with the shape of the worlr and further to provide a simple hand controlled power 00111166171011 tor shifting the carriage.

wherein an endless abrading belt In the accompanying drawings I show by way ofexample a machine which represents the preferred embodiment of my invention, and it should be understood that the following detailed description of this particular embodiment given only for the sake of imparting an understanding of the inventionas applied to the machines of the patcute. I do not intend hereby to limit the invention to the precise construction disclosed in the drawings but aim to cover all modificatii'ms, equivalents and alternative constructionsfalling within the scope of the appended claims.

In the drawings Figure 1 is a front elevationalview of the improved machine.

Fig. 2 is a plan View.

Fig. 3 is a detailed cross sectional view of the machine on the line 33 of Fig.

Referring to the drawings the supporting frame of the machine comprises the end ils 1 and the lower connecting momand the top 4; which serves as the bed of the machine. On the pedestals are guides 5 on which brackets 6 and 7 are vertically .75 adjustable, said brackets having the horizontal rails 8 and 9 for rollers l0 and ll, which support a WOIlClEOlfllllg platform 12. The platform is thus verticall adjustable and horizontally shi'lt'table on the machine frame. Inasmuch as any suitable me: well known in this art may be used for vertically adjusting the brackets 6 and '7, I have deemed. it unnecessary to illustrate such adjusting mechanism.

At the left end. of the bed at. there is a transversely extendin drive shaft 13 driven through gearing 14. by a motor 15. The shaft 13 has a pulley 16 at its front end which drives an abrading belt 17, which passes over a similar pulley 18 at the right.

A rear end the drivingshaft has a beveled gear 21 meshing with. a second beveled gear 22 on a shait 23 positioned longitudinally oi the machine. The shaft 23 has a longitudinal heyway 2-ithercin for splinmechanism and receives power through ing thereon a beveled gear carried in bracket 26. he beveled gear meshes .with a gear 27 rigid on a shaft 28 and parcarriage 31 contains the shoe controlling the shaft 28 (Fig. 2) which bears in the rear right hand portion of the carr age 31. The splined shaft 23 and the carr age thus cooperate to permit adjustments without affecting the distribution of power.

In order to make clear the general arrangement of the major parts of the machine a brief description of the essential parts thereof is here given.

i There is provided a reciprocatory steel tape parallel with the runs of the sanding belt 17 and preferably mounted between them. A; rail or track parallels the band to provide support for the presser shoe which is adapted to act upon the belt ant. to

press it ontothe work. A plurality of parallel'rods are associated wlththe track for the shoe and serve to movably support the track and shoe to permit raising the shoe from the belt after the shoehasbeen unclamped or freed from the reciprocating steel'tape. The reciprocation of the tape 1s controlled by suitable speed power connections and suitable stroke adjusting mechanism as'will hereinafter appear. The detailed structure of the parts will be found. in the above mentioned patents.

The numeral 32 represents a shoe which runs on a rail or track The rail sup ported for motion vertically by a parallelomounting. On each end of the grain lin'ir machine bed 4: there are mounted a pair of brackets .34 each pair carrying an upper horizontalbar 35 (r 1g. 3) and a lower hori zontal bar 36, the bars being parallelin a vertical plane. A horizontal link 37 pivoted on bar 35 pivotally supports a forward. upper bar 38., A. forward lower bar 39 is supported from the lower rear bar 36 by a horizontal link 40 and from bar 38 by a vertical linlr 41. This vertical link extends below the four parallel bars and has an L projection 42 thereon which carries the rail or track 33. The parallel linkage above described thus supports the shoe for vertical motion. A weight 42? is. used to counterbalance the shoe, said weight being adj awably mounted. on a link pivotally secured to the two upper bars 35 and 38;

On the ends of the machine bed there are transverse shafts 4L3, each of which has at theforward end a drum or wheel l land at the rear end a pinion 45. A steel tape 46 isv stretched from one drum to the other being wound on each in order to reciprocate as the shafts carrying the drums oscillate neetion between together. At the rear of the machine upstanding brackets 17 supper ar segments 48 which mesh with the pinons .45. The twosegments d8 are interconnected by a link f?) for synchronous oscillation. A driving rod 50 serves to oscillate one of the gear j segments thus causing each segment to act on its pinion 45 to r ciprocate the steel tape 46. On the shoe there is provideda handle 51 which when properly controlled operates clamping mechanism associated with the,

shoe by whie the shoe is made to clamp the tape. The details of the mechanism may be found in the cited patents.

On the movable carriage Slthere is a driven shaft 52 which carries a disk wheel 53. In the wheel taere is a diametrical way 54-. A slidable head 55 moves in the way 54 to vary the eccentricity thereof. 1 portion 56 of the head is pivotally related to the sliding portion mounted in the way and. formed so as to receive and clamp the end of drivingrodfil); Suitable mechanism, not shown, is provided to adjust the eccentricity of the slidable head while the shaftv 52 rotates, the mechanism including a worm screw 57 engaging the head 55-and a control member 58 for the operator to regulate the eecentri ity, thereby to vary the stroke of the shoe. In Figs.% and 3 there shown suitable mechanism for disengagingand for varying the s. d ratio of the power conthe driving shaft 28 and the driven shaft 52 of the movable head or carriage 3". A description of the parts is herein omitted since they form no part of the present invention. 7 Y 7 In order to permit shifting of {the center of the stroke of the shoe without uncoupling the shoe from the belta displacement of the-band is made. This isbest effected by moving the carriage 31. It is clear that the carriage can be moved withouteiiecting its driving shaft 52 because connection with shaft 23. The driving rod 50 merely moves the gear segments to a new operative position without materially effecting the length of the stroke. Because of the large ratio between the gear segments f8 and the pinions 45 a slight n1 vement of the carriage is considerably multiplied in shifting the band. I 1

In order to shift the carriage a feed screw 60 is provided longitudinally of the bed, there being a nut member 61 on the carriage 31 projecting through a slot 62 of the bed 41. A powerfeed for the screw is preferred and is associated with a conveniently located manual control. In the machine of the drawings the feed screw 60 is located in a plane below the main driving shaft 13. A counter shaft 63 is therefore provided below shaft 13 parallel therewith. Speed reducing gears 6 and 65 are provided between carried bv .id head to eiicct a mo "both sliortened and accomp thetwo shafts. A. bevelclutch tWO-WtlY transmission mechanism of well known chari at, w fl 1 n m1 f" P9 ii i actor 1s plouc ea c ween ie l! .b 00 and the iced screw shaft 60, said mechanism oogenerally designated 66 and containing a shiitablc collar 67. A slii'ltii'ig lGt'Ql 68 for said collar extends doWm-vardl and tor wardly of the machine and providoiil with a handle for the operator to control the power connection.

In operating upon an irre 'nlarly shaped workpiece represented by the grand piano top' vV, the device is set so that the Work initially operates with its strokecentercd over the center of the Work on the Wide edge. The parts can readily be adjusted properly first, by positioning the Wheel with its diametrical ayvertieelly disposed. The shoe 32 is then clamped over the center of the Work, that is, the center of the wide edge of the piano top W. The stroke of the shoe is usted by moving the head along the Way 5 1 so that when the way 54 is hori- Zonaally disposed the shoe 1s at the desired limit. As the Work moves progressively through the macnine to a point Where the rear curved portion of the Work piece I is located it is evident from lfig. 1 that the work on the right end of the original long path of reciprocation will he Therefore, it is desirablethat the stroke he lifted to traverse only the navrowcr rear portion of the work piece, The shortening of the stroke can be readily iihed through the control 58 which es the eccentricity of the head 55 to vary, thereby shortening" the stroke oi rod 50. At the some time the control member is niovcdio allow the power from the dr vi 11g shaft to move the carriage. This |m ports to the gear segments a rotation in ad ditionto their oscillation and thereby moves the belt and shoe to shl'l't the path oi the reciprocetm shoe It 18 clear that any skilled .Worlonen experienced with the marne can readily cause the shoe to change location and its path of reciprocation lithe advance of the Work Without necesa stopping of the machine and with nnclamping the shoe from the band.

I claim as my invention: 1. An ehrading machine comprising, in

combination, an abreding element, a rec1pro a catory shoe adapted to apply said ahrading element to a piece of Work, a tape to move Wasted.

to move the h sad to shift the paths oi oscillation and reciprocation. i

2. An ebrnding machine comprising, in combination, an ahrading element, a reciprocatory shoe adapted to apply said abreding move the shoe, synchronously oscillatory drums upon which the tape is supported to move the shoe, drlv r member, a crank ()PQ'i'filllO thereby to oscillate the drums, means to support sold crank adwstahly rela-" tivcly to said drnmmwnnl means to move said supporting means bodily whereby to shift the reciprocating tape and shoe.

Anedarading machine comprising, in

combination, an abreding element, a reciprocetory shoe adapted to apply said abrading element to a piece of Work, a tape to move the shoe, interconnected rotary drums upon which the tape is wound to move the shoe,

1 i element to a piece of work, a steel tape to a crank arnrarranged on oscillation to move said drums, means to oscillate said arm, and other means to displace said arm to displace the path of reciprocation oi the tape and shoe. i 1 at. An ebreding machine comprising, in combination, an ahi'ading element, a reciprocatory shoe adapted to apply said abrading element to a piece of Work, a steel tape to move the shoe, interconnected rotary drums npon wh ch the tape is Wound and to move the shoo,n1eans to oscillate the drums to reciprocate said shoe, and means to impart an angular displacement to sand drums independently oi their oscillatory movement whereby to shift the path oi reciprocation of the shoe.

5. An abradinp; machine comprising, in comhiinition, an abrading element, a reciprocatory shoe adapted. to apply said ahrading;

element to ,1 piece of work, a steel tape to move the shoe, power driven means to eiiect e reciprocation ot the tape, and means to displace the tape in its direction of reciprocation indeiendentl of the rcciorocator i l movement thereof and While said reciprocatory movement continues.

6. An alorading machine comprising, in combination, an ahrading element, a reciprocatory shoeadapted to apply said abradingy element to a piece of Work, power-driven meansto reciprocate the shoe ove: a determinable path, and means controllable during the operation olf the machine to displace said reciprocating meansto shift the center of the path of reciprocation with respect to the Work.

7. In machine of the class described,a movable carriage containing mechanism to control the speed and stroke of e reciproory element which is mounted independ or My thereof, a connecting rod having one end mounted on the carriage to effect reciprocation of the element, and mcansto CERTIFICATE OF CORRECTION.

Patent No. 1,762,339. Granted June 10, 1930, to

CARL LAWRENCE MATTISCN.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 4, line 40, claim 11, strike out the compound word "power-driven and insert the same before the word "means in line 3, of said claim; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 9th day of September, A. D. 1939.

M. J. Moore, (Seal) Acting Commissioner of Patents. 

